From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Graph showing the governor advance characteristics of a DCD 838 distributor with different spring configurations.
| Identifier | ExFiles\Box 168\3\ img162 | |
| Date | 25th March 1931 | |
| GA 22 DISTRIBUTOR DCD 838 GOVERNOR DW 814 DEGREES ADVANCE DISTRIBUTOR SPEED R.P.M. (1) (2) (3) (4) LIMITS GOVERNOR ADVANCE OF R.R. DISTRIBUTOR TO DCD 838 (R.R.L) SHOWING CHANGE IN CHARACTERISTIC WHEN USING DIFFERENT SPRINGS 1. WITHOUT ANY SPRINGS. 2. USING ONE SPRING ONLY .033" DIA WIRE 9 COILS .175 OUTSIDE DIA. 3. USING TWO SPRINGS 1ST .028 DIA WIRE 8 COILS .185 OUTSIDE DIA. 2ND AS IN 2. 4. USING TWO SPRINGS 1ST .028" DIA. WIRE 8 COILS .185 OUTSIDE DIA. NOTE:- CURVE 4 IS SIMILAR TO 3 UP TO 9° ADVANCE. LIMITS ARE TO SPEC'N ELC 37/1 G.J 25.3.31 | ||